A rare or archaic term for a small ornamental helmet or decorative headpiece, possibly a variant of casquet.
An obscure form combining casque with diminutive suffixes -et and -el, most likely from Middle French, referring to very small or decorative helmet forms.
This ultra-obscure word might be one of English's forgotten terms — it appears in only the oldest dictionaries, suggesting it was specialized armor-maker's vocabulary that disappeared when those crafts changed!
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